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Since you havent used it in a year, lets try master resetting the device.
Once thats complete, it should show the setup wizard again. Run through the initial setup and it should allow you to pair the device with your garmin connect app.
Let me know if you get stuck or run into any issues,
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At the same time, after repairing dozens of these devices its always smart to start with a reset first.. That ensures the software is working normally.. after that, we focus on the software and pairing with an outside device.
Glad to hear all is working though.. If you need any further help, let me know.